Let's say I want to wait on a particular `vm_page_t'. The `vm_page_t'
needs to contain a `condvar_t'. Or more precisely *every* `vm_page_t' in
the system needs to contain a `condvar_t' even if it's only used in one
piece of code. If you have 1 byte `condvar_t' and 1000 pages of RAM
that's 1K. If the `condvar_t' is a pointer in LP64 that's 8K. (Ignoring
structure alignment and packing issues that may waste more space.)
let me just say that bloating vm_page some more is simply a bad idea
and should be rejected... it is too large, already.